"While still early, as we analyze the demographics of our exchange membership, we are seeing enrollees skewing a bit more to the younger side," Broussard said. "This is likely the result of premium-subsidized younger enrollees choosing the lower deductibles offered with the higher metal tier plans."

Humana said about 35 percent of those who enrolled by the end of January were between 21 and 40.

At last report, the ACA exchanges had 24 percent between 18 and 34 with a target of about 40 percent in that age group -- but officials said previous experience shows that young people tend to wait until closer to deadline, in this case March 31, before signing up.

The proportion of Humana’s younger exchange applicants has been slightly rising with time, bolstering those arguments, the Kaiser blog reported.

Humana spokesman Mitch Lubitz told AL.com that the company was not releasing numbers by state. He said the company has several outreach programs, including a partnership with the YMCA that may be helping draw a younger demographic. He said specific to Alabama, there has been outreach in Walmart stores.